Simpleperf: add auto generated summaries in stat command.

When there are summaries monitoring one event type in user
space and kernel space at the same time period, we can automatically
generate a summary combining the results generated in user space and
kernel space.
This can help to decrease the number of needed hardware counters.

Also adjust scale check when deciding whether an event is monitored
all the time.

Bug: 29213742
Change-Id: I272e21420700c10fccb1336a1e60138db8d13b3d
Test: run simpleperf_unit_test.

1 files changed, 17 insertions, 0 deletions

diff --git a/simpleperf/cmd_stat_test.cpp b/simpleperf/cmd_stat_test.cpp
index 0bb7d855..4d63498a 100644
--- a/simpleperf/cmd_stat_test.cpp
+++ b/simpleperf/cmd_stat_test.cpp
@@ -16,7 +16,9 @@
 
 #include <gtest/gtest.h>
 
+#include <android-base/file.h>
 #include <android-base/stringprintf.h>
+#include <android-base/test_utils.h>
 
 #include "command.h"
 #include "get_test_data.h"
@@ -92,3 +94,18 @@ TEST(stat_cmd, group_option) {
                               "cpu-cycles:u,cpu-clock:u", "--group",
                               "cpu-cycles:k,cpu-clock:k", "sleep", "1"}));
 }
+
+TEST(stat_cmd, auto_generated_summary) {
+  TemporaryFile tmp_file;
+  ASSERT_TRUE(StatCmd()->Run({"--group", "cpu-clock:u,cpu-clock:k", "-o",
+                              tmp_file.path, "sleep", "1"}));
+  std::string s;
+  ASSERT_TRUE(android::base::ReadFileToString(tmp_file.path, &s));
+  size_t pos = s.find("cpu-clock:u");
+  ASSERT_NE(s.npos, pos);
+  pos = s.find("cpu-clock:k", pos);
+  ASSERT_NE(s.npos, pos);
+  pos += strlen("cpu-clock:k");
+  // Check if the summary of cpu-clock is generated.
+  ASSERT_NE(s.npos, s.find("cpu-clock", pos));
+}